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TITLE 8 DIVISION OF INDUSTRIAL ° TY 58.15 UNFIRED PRESSURE VESSEL SAFtTf ORDERS (Register 78. No. X2-57-78) (d) The use of the following is prohibited: (1) Valves, cocks, and pipe fittings of semisteel other than ASTM Specification Nos. A 536-67, Grade 60-40-18; A 395-68; A 445-66; A 47-68, Grade 35018; unless they have a pressure rating of not less than 600 psi WOG. In no case shall valves of semisteel other than the 4 ASTM Specifications listed above be used for primary stop valves. Cast iron fittings made specifically for anhydrous ammonia service, meeting ASTM A-126-56, class B or C, may be used for secondary service if they have a service rating of at least 600 psi. (2) Street ells and screwed service tees unless they are extra-heavy forged construction. (3) Valves of a design that will allow the valve stem to be removed without removal of the complete valve bonnet, unless the flow is restricted by an inlet orifice to not more than 54 drill gage size. (4) Ordinary solid-wedge-type gate valves unless there is another stop valve of acceptable type between the gate valve and tank. (5) Valves with valve stem packing glands which cannot be re- packed under pressure, unless there is another valve of acceptable type between it and the tank. (5) Threaded aluminum fittings and/or adapters that are required to be connected or disconnected as part of the filling or transfer operation. (7) Copper and brass pipe, fittings, valves, etc. ! (8) Pipe, fittings, etc., that are galvanized or otherwise plated with material which is attacked by ammonia where such plating or galvanizing is exposed to ammonia. (e) Except for service valves, safety relief valves, and gaging connec- tions, all liquid and vapor connections shall have 1 of the following 'installed directly in the tank connections: (1) Connections up to and including 4-inch pipe size: (A) A back-pressure check valve. (B) An excess-flow valve. Excess flow valves shall be designed with a bypass, not to exceed a No. 60 drill-size opening to allow equalization of pressures. All excess flow valves shall be plainly and permanently marked with the name or trademark of the manufacturer, the catalog num- ber, and the rated capacity. (C) A manually operated check valve (internal valve) equipped with means for closing the valve from a point remote from the delivery connection and with such control mechanism fitted with a fusible section having a melting point of 208 degrees Fahrenheit to 220 degrees Fahrenheit which will cause the valve to close au- tomatically in case of fire. (D) A positive check valve (internal valve) which can be oper- ated manually and which will close automatically on excess-flow conditions and which can be closed manually from a point remote from the delivery connections. Such valve shall also incorporate a fusible section as required in Section 507 (e) (1) (C) which will cause the valve to close automatically in case of fire.